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05MRK--01
G34810
E23
E24
--
DIAGNOSTICS
ECD SYSTEM (1ND--TV)
05--25
COROLLA Supplement (RM1129E)
TERMINALS OF ECM
HINT:
The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropri-
ate conditions for checking each pair of terminals is also indicated.
The result of checks should be compared with the standard normal voltage for that pair of terminals, dis-
played in the STD Voltage column.
The illustration above can be used as a reference to identify the ECM terminal locations.
Symbols (Terminals No.)
Wiring Color
Terminal Description
Condition
STD Voltage (V)
+B (E24--61) -- E1 (E24--2)
B--W -- W--B
Power source of ECM
Ignition switch ON
9 to 15
+B (E24--1) -- E1 (E24--2)
B--W -- W--B
Power source of ECM
Ignition switch ON
9 to 15
IGSW (E24--70) -- E1 (E24--2)
SB (B--O) -- W--B Ignition switch
Ignition switch ON
9 to 15
MREL (E24--42) -- E1 (E24--2)
GR -- W--B
EFI MAIN Relay
Ignition switch ON
9 to 15
MREL (E24--42) -- E1 (E24--2)
GR -- W--B
EFI MAIN Relay
Ignition switch OFF
0 to 1.5
GREL (E24--81) -- E1 (E24--2)
G--R -- W--B
Glow plug relay
Ignition switch ON at cold engine
(Engine coolant temperature is less
than 20
˚
C (68
˚
F))
5 to 15
GREL (E24--81) -- E1 (E24--2)
G--R -- W--B
Glow plug relay
Idling at warmed engine
0 to 1.5
VPA1 (E24--15) --
EVPA1 (E24--54)
G -- Y *
1
Y -- L *
2
Accelerator pedal position
sensor (for engine con-
trol)
Ignition switch ON, accelerator ped-
al fully released
0.5 to 1.1
VPA1 (E24--15) --
EVPA1 (E24--54)
G -- Y *
1
Y -- L *
2
Accelerator pedal position
sensor (for engine con-
trol)
Ignition switch ON, accelerator ped-
al fully depressed
3.0 to 4.6
VPA2 (E24--14) --
EVPA2 (E24--53)
W -- Y *
1
B -- L *
2
Accelerator pedal position
sensor (for sensor mal-
function detection)
Ignition switch ON, accelerator ped-
al fully released
0.9 to 2.3
VPA2 (E24--14) --
EVPA2 (E24--53)
W -- Y *
1
B -- L *
2
Accelerator pedal position
sensor (for sensor mal-
function detection)
Ignition switch ON, accelerator ped-
al fully depressed
3.4 to 5.0
VVPA1 (E24--34) --
EVPA1 (E24--54)
B -- Y *
1
W -- L *
2
Power source of acceler-
ator pedal position sensor
(for VPA1)
Ignition switch ON
4.5 to 5.5
VVPA2 (E24--33) --
EVPA2 (E24--53)
B -- Y *
1
L -- L *
2
Power source of acceler-
ator pedal position sensor
(for VPA2)
Ignition switch ON
4.5 to 5.5
VG (E23--36) -- EVG (E23--15)
G -- L -- Y
Mass air flow meter
Idling
0.5 to 3.4
THAF (E23--7) --
ETHAF (E23--6)
G--R -- BR
Intake air temperature
sensor
Idling, intake air temperature at 20
˚
C (68
˚
F)
0.5 to 3.4
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TOYOTA COROLLA REPAIR MANUAL SUPP 1129E